Why does one case swing TRIR for small employers and is it recordable or first aid?

A worker leaves the clinic with a butterfly bandage, and the supervisor asks whether it goes on the log. A week later the owner asks what one more case would do to the rate. Practitioners are regularly discussing both questions on Reddit, and Ideagen follows those conversations to add to them. This piece gives a decision path for first aid versus medical treatment, then a worked illustration of how far a single case moves the total recordable incident rate (TRIR) at different headcounts.

A recordable case is a work-related injury or illness that OSHA requires the employer to enter on its injury and illness log. For the basics of what makes a case recordable and the OSHA forms involved, see Ideagen's overview of US recordable incidents. This post moves straight to the first aid decision and what one case does to a small employer's rate.

Is this injury OSHA recordable or just first aid, and how does one case affect TRIR for a small company?

The line between first aid and medical treatment decides most borderline cases. OSHA's first aid list is comprehensive: a treatment that is not on it counts as medical treatment beyond first aid. Read the full definition before classifying a case. OSHA's May 2024 enforcement memorandum covers the same ground, and it is where the regulator sets out the list and the warning that repeated first aid for the same worker can draw scrutiny.

Use OSHA's list of first aid treatments and its guidance on repeated first aid as the reference for every case in this decision path. Clinic staff are often unaware that OSHA's definition differs from the clinical one, so the check belongs to the employer.

Step one: match the treatment to the first aid list

Ask exactly what was done to the worker, not how serious the injury looked. Cleaning a wound, using a bandage or butterfly bandage, hot or cold therapy, non-rigid wraps, removing a splinter by simple means and drinking fluids for heat stress are all first aid. So is a nonprescription medication at nonprescription strength. A physician applying one of these treatments is still providing first aid.

Several common treatments tip a case the other way. These include sutures or staples, a rigid immobilization device, physical therapy or chiropractic treatment, an immunization other than tetanus, such as the hepatitis B vaccine, and a physician recommending a nonprescription drug at prescription strength. Any one of them makes the case medical treatment beyond first aid.

Step two: check whether anything else makes the case recordable

Each recording criterion operates independently. A cut treated only with first aid is still recordable if it leads to restricted work or a job transfer. Days away from work and loss of consciousness work the same way. Ask for the treatment record, then ask what the worker did the next shift.

Step three: look for repeat first aid on the same complaint

The OSHA memorandum warns that repeated first aid for the same worker with the same concerns may signal that necessary medical care is not being provided. It also notes that repeat first aid can point to a problem under the medical services and first aid standard at 29 CFR 1910.151(a), which expects employers to consult available medical personnel where appropriate. At a small site, one worker returning to the first aid kit for a sore wrist three times in a month is the case to send for a medical evaluation.

What one recordable case does to TRIR at four headcounts

The arithmetic is simple, and it explains why rate alone misleads at a small site. Each example below assumes 2,000 hours per full-time employee a year. At 40,000 hours worked, about 20 full-time employees, one recordable case gives a TRIR of 5.0 (1 x 200,000 / 40,000). The same single case at other sizes:

1. 20 employees (40,000 hours): one case gives 5.0 and two cases give 10.0.
2. 50 employees (100,000 hours): one case gives 2.0 and two cases give 4.0.
3. 100 employees (200,000 hours): one case gives 1.0 and two cases give 2.0.
4. 500 employees (1,000,000 hours): one case gives 0.2 and two cases give 0.4.

The same event produces a rate 25 times higher at 20 employees than at 500. A small site with no cases reports 0.0 one year and 5.0 the next with no change in how it works. Leadership reads that jump as a safety collapse, and the reverse jump as a success, when both are one case. Report the case count and hours worked next to the rate, and describe each case in a sentence, so the number is read in context.

Reading a small site's recordables: four patterns and four responses

Classify on the treatment record and read the rate with its case count

A small employer can settle most first aid questions by matching the treatment to OSHA's list, checking for restricted work and watching for repeat visits. The rate then needs the context that one case at 40,000 hours is worth 5.0 and the same case at 1,000,000 hours is worth 0.2. Case counts, hours worked and a rolling 12 months give a small site a fairer measure than a single year's rate.

Readers who want to compare how they classify borderline cases can continue the discussion in Ideagen's Reddit community.