The Operative Sentence

What makes something regulated waste is a definition in 1910.1030(b), and “it looks contaminated” is not in it

The federal definition has five limbs, the compression test is only one of them, and state law adds to all five.

DECIDED BY: 29 CFR 1910.1030(b) → your state medical waste rule → your facility’s exposure control plan and waste policy. Not the appearance of the item.

In brief

• The definition at 1910.1030(b) has five limbs. The compression test is one of them, and it is the second.1
• OSHA’s own compliance directive instructs its inspectors not to squeeze or shake a bag of waste to make the determination, and to judge instead from visible factors and from what employees say.2
• Red bags are offered by (g)(1)(i)(E) as a substitute for a warning label. Nothing in the standard requires a red bag, and nothing attaches a consequence to the colour by itself.1
• In the two published US audits that opened red bags against a written definition, 14.9% and 11% of the contents met regulated-waste criteria. Both were single-site and short — one emergency department, one dermatology clinic — so the figure may not transfer.78
• We found no US operating-room or inpatient study that opened red bags and reported a percent-correct figure. One ICU audit says in its own limitations that it could not.9

The definition, and what kind of sentence it is

The question that has recurred on nursing and surgical-technology boards for twenty years is put in physical terms — this dressing, this glove, this drape, red bag or regular trash — and it is almost always answered with an adjective. Soaked. Grossly contaminated. Visibly soiled. The federal standard people are told about contains none of those words. It contains one sentence, and the sentence is a list.

Regulated Waste means liquid or semi-liquid blood or other potentially infectious materials; contaminated items that would release blood or other potentially infectious materials in a liquid or semi-liquid state if compressed; items that are caked with dried blood or other potentially infectious materials and are capable of releasing these materials during handling; contaminated sharps; and pathological and microbiological wastes containing blood or other potentially infectious materials.

Contaminated means the presence or the reasonably anticipated presence of blood or other potentially infectious materials on an item or surface.

Read the full sectionArchived copy

Both definitions sit in paragraph (b), and the second is where much of the confusion begins. Contaminated is very wide: the presence, or the reasonably anticipated presence, of blood or other potentially infectious materials.1 A glove worn during a dressing change is contaminated in that sense. Regulated waste is narrower and is not a synonym. Every limb of it except the sharps limb asks about the material’s capacity to come back out of the item — as a liquid, as a semi-liquid, or as flakes of dried blood during handling. This is a worker-protection rule, and what it protects against is the material getting onto somebody downstream.

The second thing to notice is what kind of sentence it is. It is a classification, not a destination. It says what counts, not what to do with what counts, and it does not say that what counts goes in a red bag; the only OSHA provision on disposal, at (d)(4)(iii)(C), defers the whole question to federal, state and local law.1 That is the subject of our article on the three layers of law.

Five limbs, and the one everybody quotes

Set out as a list, the definition reads: (1) liquid or semi-liquid blood or OPIM; (2) contaminated items that would release blood or OPIM in a liquid or semi-liquid state if compressed; (3) items caked with dried blood or OPIM and capable of releasing these materials during handling; (4) contaminated sharps; and (5) pathological and microbiological wastes containing blood or OPIM.1

The compression test is limb two, and it is the one that circulates without the other four — which is why an argument about a soaked dressing can be conducted at length by people who have never had to think about limb three. Limb three catches the item that is dry, with dried blood caked on and capable of flaking off during handling; a compression test would clear it. Limb five reaches a category that has nothing to do with how wet anything is. Limb one reaches the fluid itself, which is why a full suction canister of blood is regulated waste on the face of the definition.

What none of the five limbs asks is how the item looks. The definition contains no adjective of appearance, no volume, no percentage and no threshold. It asks a physical question about what the item would do.

What OSHA tells its own inspectors

The compression test invites an obvious question — does somebody squeeze the bag? — and OSHA answered it in 2001, in the compliance directive that governs how its inspectors enforce the standard.

The compliance officer should not use the actual volume of blood to determine whether or not a particular material is to be considered regulated waste, since 10 ml of blood on a disposable bed sheet would appear as a spot (not regulated waste) while the same amount of blood on a cotton ball would likely cause saturation and dripping (regulated waste). Similarly, an item may adequately contain these materials when in a static state yet liberate them when compacted in the waste container. Instead, the compliance officer should consider the potential for generation of bulk blood (i.e through dripping or flaking off of material that may contain either blood or OPIM). Under no circumstances should a bag of waste be squeezed or shaken to determine this. The compliance officer should exercise professional judgment to make a determination based on visual factors such as a pool of liquid in the bottom of the container or dried blood flaking or falling off during handling, or based on employee interviews.

Read the full directiveArchived copy

Three things in that paragraph are worth separating. Volume is expressly rejected as the test, with a worked example: the same 10 mL of blood is not regulated waste on a bed sheet and is regulated waste on a cotton ball.2 The mechanism the directive has in mind is “when compacted in the waste container” — a real event that happens to a bag, not a hand squeezing a dressing. And the determination is evidentiary: a pool of liquid at the bottom of a container, dried blood flaking off during handling, or what the people who work there say.

The words that are not in the standard

We retrieved the full codified text of 29 CFR 1910.1030 and scanned it for the vocabulary this argument is normally conducted in.

“Saturation” and “dripping” are real regulatory words: both appear in the OSHA directive quoted above, in the worked example about the cotton ball,2 and they are the words several states chose. What they are not is the text of the federal definition. A policy that cites 1910.1030 for a saturation rule is citing the wrong document for a rule that may well be correct under a different one.

The red bag is a substitute for a label

The other thing the standard does not do is mandate the bag. The obligation in paragraph (g) is to label, and the red bag arrives as an alternative to labelling. Subparagraphs (B) to (D), omitted from the extract below, specify the legend, its colours and how the label is affixed.

(A) Warning labels shall be affixed to containers of regulated waste, refrigerators and freezers containing blood or other potentially infectious material; and other containers used to store, transport or ship blood or other potentially infectious materials, except as provided in paragraph (g)(1)(i)(E), (F) and (G).

…

(E) Red bags or red containers may be substituted for labels.

Read the full sectionArchived copy

The state layer, where the variation actually lives

Every state that regulates medical waste writes its own definition, and those definitions are what a hauler’s manifest, a state inspector and a facility policy are usually built on. We read three, chosen because they are structurally different from one another rather than because they are representative.

Vermont adopts the federal five limbs almost word for word, then adds to them.

(1) The following types of solid waste are considered RMW:

(A) Pathological and microbiological waste containing blood or OPIM;
(B) Contaminated items that would release blood or OPIM in a liquid or semi-liquid state if compressed;
(C) Sharps;
(D) Animal infectious waste;
(E) Liquid or semi-liquid blood or OPIM;
(F) Items that are caked with dried blood or OPIM and are capable of releasing these materials during handling; and
(G) Other wastes not included above as determined by the Secretary.

(2) Exclusions. The following types of solid wastes are not considered RMW:

… (C) Nasal secretions, sputum, tears, sweat, urine, and vomitus unless they contain visible blood;

Read the full procedureArchived copy

Limb (C) is “Sharps”, not “contaminated sharps”, which is broader than the federal text. Limb (G) is an open residual clause held by a state official. And the exclusions, of which we quote one of five — the others concern hazardous waste, ceremonial remains, teeth and home-generated waste — do something the federal standard never does, which is to name common substances and say expressly that they are out unless there is visible blood.5 It is also the definition the dermatology audit discussed below used to score its bins.8

California does not use the compression test for blood at all. Its biohazardous-waste definition asks whether the material is fluid at a particular moment.

(C) Waste that, at the point of transport from the generator’s site or at the point of disposal contains recognizable fluid human blood, fluid human blood products, containers, or equipment containing human blood that is fluid, or blood from animals suspected by the attending veterinarian of being contaminated with infectious agents known to be contagious to humans.

Read the full sectionArchived copy

Two features of that sentence do work. “Recognizable fluid” is an observational test, closer to the plain-English intuition than the federal one is; and the test is fixed to a time — the point of transport off site, or the point of disposal — so an item that was wet in the room and is dry when the bag leaves is being asked a different question than the federal definition asks.4 California also carries a category the federal standard has no analogue for, at § 117690(b)(1)(D): waste contaminated with excretions or secretions from a patient whom infection control, the attending physician or the local health officer has required to be isolated.4

North Carolina uses a defined term and a volume, keying several duties to whether a container holds more or less than 20 millilitres.6

“Blood and body fluids” means liquid blood, serum, plasma, other blood products, emulsified human tissue, spinal fluids, and pleural and peritoneal fluids. Blood and body fluids does not include dialysates, feces, or urine if not removed during surgeries and autopsies.

Read the full ruleArchived copy

That list is not the federal OPIM list. It adds emulsified human tissue; it omits semen, vaginal secretions, synovial fluid, pericardial fluid, amniotic fluid and dental saliva, all of which are OPIM federally;1 and it carves urine and faeces in or out depending on whether they were removed during surgery or autopsy.6 The 20 mL threshold then runs in a direction most readers do not expect; we set it out row by row, with the quoted text, in the state sewer-law register.

Three states, three structures: a federal-plus-residual list, an observational fluid test tied to a moment, and a defined fluid list with a volumetric threshold. An item can be regulated waste under one and not another, and none of that variation is visible in the federal sentence everyone is arguing about.

CDC’s own account of how the line gets drawn

The most candid statement in the federal literature about how any of this is decided is not in a regulation. It is in the CDC and HICPAC environmental infection control guideline, in the section on regulated medical waste.

Although any item that has had contact with blood, exudates, or secretions may be potentially infective, treating all such waste as infective is neither practical nor necessary.

Therefore, identifying wastes for which handling and disposal precautions are indicated is largely a matter of judgment about the relative risk of disease transmission, because no reasonable standards on which to base these determinations have been developed.

State regulations also address the degree or amount of contamination (e.g., blood-soaked gauze) that defines the discarded item as a regulated medical waste.

Read the full sectionArchived copy

The middle sentence is the one to take back to whoever wrote the policy. The agency people cite for the infectivity of medical waste says in its own guideline that the sorting decision is a matter of judgment about relative risk, and that it is a matter of judgment because no reasonable standards for making it exist.3 The same section states that “no epidemiologic evidence suggests that most of the solid- or liquid wastes from hospitals, other healthcare facilities, or clinical/research laboratories is any more infective than residential waste,” and explains that the field adopted the term regulated medical waste rather than infectious waste precisely to stop implying a finding about infectivity.3 OSHA’s directive gives the same reason for the same word choice.2

What the audits measured, and the hole in the middle of them

Two US studies have opened red bags, applied a written definition and published a percentage. In a 24-hour audit of an urban tertiary-care emergency department on 25–26 July 2019, covering 671.8 kg of waste in total and 71.665 kg of it in red bags, 14.9% of the red-bag contents met regulated-waste criteria.7 In a 30-day audit of a private outpatient dermatology practice, 11% of the waste in the regulated-waste bins was appropriately placed before any intervention, rising to 69.4% after two thirty-minute staff education sessions.8

Both figures come with limits that belong next to them. The emergency-department audit excluded sharps containers, “which were not individually audited for safety reasons,” so the denominator is red bags without sharps.7 The dermatology study scored its bins against the regulated-waste definitions of Vermont and New York State, in a practice located in California, and its own summary table renders those definitions in the working shorthand of the field: gloves, gowns, masks and dressings count “only if dripping/soaked with blood.”8 On that evidence a red bag in some other setting may hold a comparable share of material that does not meet the definition, and the certainty is low.

The gap matters more than the numbers. We found no US operating-room or inpatient study that has opened red bags and reported a percent-correct figure. The nearest attempt says so itself: a 24-hour audit of a neurological intensive care unit reports in its limitations that “we were unable to open and sort RMW, PHI, and sharps waste to determine correct categorization due to safety and privacy concerns,” and substitutes a sensitivity analysis across assumed mis-sorting rates.9 The setting where the volumes are largest and the case for sorting is made most often is the setting nobody has measured. That is a finding about the record; it says nothing about what an OR red bag contains.

What facilities have done with this

The operational response has largely been to change where the bins are rather than to relitigate the definition. Practice Greenhealth’s 2023 benchmark tables record that 71% of reporting facilities had eliminated the standard use of red-bag containers in regular patient rooms.10 That figure is drawn from the 2022 calendar or fiscal year, as reported on 2023 Environmental Excellence Award applications, by hospitals that chose to apply for an award for environmental performance — a self-selected cohort, not a census of US hospitals.10 We could not retrieve a later benchmark report, so the most recent figure we hold for this metric is the 2022 collection year.

Two published accounts describe a mechanism. A Brigham and Women’s Hospital project, reported in the hospital’s staff bulletin, made red bins deliberately less convenient than the regular bins — smaller openings, placed further away — so that using one becomes a decision rather than a default, and reported a 29% drop in operating-room red-bag waste afterwards.11 That is an institutional newsletter reporting an uncontrolled before-and-after with no published method, and should be read as such. A multi-departmental quality-improvement report from an Ohio health system, using staff education, receptacle signage and changes to container availability and size, reports monthly regulated-medical-waste weight falling from 56,366 lb in 2022 to 45,148 lb in 2023 and 37,017 lb in early 2024.12 We read only that report’s abstract; its full text would not download for us.

In our assessment the useful consequence is narrow. When someone hands you a rule about red bags, the productive question is not whether the item looks contaminated but which document the rule is in — the federal definition with its five limbs, a state rule that may use a different vocabulary and a different test, or a facility policy that is entitled to be stricter than both and often is. Those three documents are answerable by different people, and knowing which one you are standing on is the whole of the practical difference.

What would change this answer

• Your state’s definition. The three we read differ from the federal text and from each other. A state that keys its definition to fluid at the point of disposal, or to a container volume, will classify an item the federal sentence would not.
• Your facility’s exposure control plan and waste policy. A facility may be stricter than either federal or state law, and a policy that is stricter is not thereby wrong. It is simply a different instrument with a different author.
• A US operating-room or inpatient audit that opens red bags. None exists that we could find. One would settle whether the 11–15% range from an emergency department and a dermatology clinic travels to a surgical setting, in either direction.
• An OSHA revision or a new letter of interpretation on the compression limb. The definition has not been amended since the standard was published in 1991, and the enforcement guidance dates from 2001. Either could move.
• A later Practice Greenhealth benchmark report. We could not retrieve one past the 2022 collection year for the red-bag-elimination metric; a newer table would replace the figure on this page.

Where this could be wrong

The strongest objection to this page is that its state section generalises from three rules. We chose Vermont, California and North Carolina because their structures differ, not because they are typical, and we do not know what the median state definition looks like; a reader in one of the other forty-seven states can take the method from this page but not the answer. The second objection is that reading a definition limb by limb is itself an act of interpretation. The limbs are ours as a presentation device — the regulation is one sentence with semicolons, and someone could reasonably divide it differently, for instance by treating “pathological and microbiological wastes” as two. Nothing in the article turns on the number five except the claim that the compression test is not the whole of it, which survives any of those divisions. Third, the audit figures are two studies in two outpatient settings, and we have used them mainly to show where the evidence stops. If a reader takes 11–15% away from this page as a fact about their own bins, we will have written it badly.