TB Test for Employment: Skin Tests, Blood Tests and X-Rays
What a TB test for employment involves in healthcare staffing: skin vs blood tests, when a chest X-ray is needed, and what agencies should keep on file.
A travel nurse accepts an assignment starting in nine days. Her license, BLS card and references are already on file. Then the facility's credentialing team asks for TB results, and she sends a photo of a skin test card from two years ago with the reading column left blank. Now you are scrambling to find a clinic that can place and read a test before her start date, and the clock on a two-step test does not move faster because a recruiter needs it to.
A TB test for employment is one of the most common items in a healthcare credential file, and one of the most commonly delayed. The rules are not complicated, but there are several kinds of test, each produces a different kind of document, and facilities do not all ask for the same thing. Agencies that understand the options can tell candidates exactly what to bring and spot an unusable record on day one.
This is part 1 of our US Document Explainers series. Below we cover the TB screening that applies to TB test healthcare workers requirements, the difference between skin and blood tests, when a chest X-ray comes in, and how to keep the paperwork moving.
What TB screening healthcare staffing agencies collect
The Centers for Disease Control and Prevention (CDC) recommends that all US health care personnel are screened for tuberculosis on hire. Its 2019 recommendations, published with the National Tuberculosis Controllers Association, describe baseline screening made up of three parts:
- A TB risk assessment, covering things like known exposure, time spent in countries with higher TB rates, and immune suppression.
- A TB symptom evaluation.
- A TB test, either a blood test or a skin test, for candidates without a documented prior positive result.
The same recommendations moved away from routine annual testing for most health care personnel with no known exposure. That does not mean annual tests have disappeared from your world. State regulations, facility policies and some client contracts still ask for a TB test within the last 12 months, or for an annual symptom screen. The CDC itself notes that state and local rules may differ. Your job is to know what each client requires and collect to the strictest standard that applies to the assignment.
Skin tests vs blood tests: the PPD and QuantiFERON explained
The tuberculin skin test (TST or PPD)
The tuberculin skin test, often called a PPD or Mantoux test, involves injecting a small amount of tuberculin under the skin of the forearm. A trained health worker then reads the reaction, usually 48 to 72 hours later, and records the size of any induration in millimeters.
Two practical points matter for agencies:
- The test needs two visits. One to place it and one to read it. If the candidate misses the reading window, the test must be repeated.
- Two-step testing is common for baseline screening. If the first test is negative, a second test is given 1 to 3 weeks after the first is read. The CDC notes that if a candidate has a documented negative TST within the past 12 months, a single test can be enough for baseline purposes. For PPD test staffing files, that means a two-step record may be two documents or one form with two entries.
A usable TST record shows the date placed, the date read, the result in millimeters (not just "negative"), and the name or signature of the person who read it.
Interferon-gamma release assays (IGRA)
An IGRA is a blood test. The best known is QuantiFERON-TB Gold Plus; T-SPOT.TB is another. One blood draw, one lab result, and no return visit for a reading. The CDC says two-step testing is not needed for IGRAs, and IGRAs are preferred for people who have had the BCG vaccine, which can cause false positives on a skin test.
For QuantiFERON for employment, the document you want is the lab report itself, showing the candidate's name, date of collection, test type and a result of negative, positive or indeterminate. An indeterminate result usually needs repeating. Ask the candidate's clinic or the client's occupational health team how they want it handled rather than deciding yourself.
Which test should candidates get?
Unless a client specifies, either is generally acceptable for baseline screening under CDC guidance. In practice, many agencies steer candidates toward an IGRA when time is tight, because one appointment is easier to arrange than two or four. Always check the client's requirement first: some facilities insist on one type.
When a chest X-ray is needed
A chest X-ray is not a screening test on its own. It comes in when a candidate has a positive TB test.
- If a candidate tests positive and is confirmed as having TB infection, the CDC recommends a chest X-ray and symptom evaluation to rule out active TB disease.
- Candidates with a documented prior positive test do not need another TB test. Instead they should have a risk assessment, a symptom screen and a chest X-ray, or documentation of a previous normal chest X-ray.
- Repeat chest X-rays are generally not needed unless symptoms develop, but some facilities set their own rules on how recent an X-ray must be.
Candidates with untreated latent TB infection are recommended to have an annual symptom screen. Expect clients to ask for that form each year.
Positive results are medical information. Collect only what the client needs, store it securely, and do not ask candidates to explain their medical history to a recruiter. Treatment decisions belong to the candidate and their clinician.
A TB documentation checklist for your credential file
Use a simple table so recruiters and candidates know exactly what counts.
| Candidate situation | Documents to collect |
|---|---|
| No prior positive, skin test route | Two-step TST record (or one TST plus a negative TST from the past 12 months), with dates placed and read, mm result and reader's name |
| No prior positive, blood test route | IGRA lab report with name, collection date, test type and result |
| New positive result | Positive test result, chest X-ray report, symptom screen, clinician's clearance to work |
| Documented prior positive | Original positive result, chest X-ray report (current or prior normal, per client policy), current symptom screen |
| Any candidate, annually (if client requires) | Annual TB symptom screen or annual test, as the contract states |
Common rejections
Most TB delays come from documents that look right but are not usable:
- A skin test record with no reading recorded.
- A reading outside the 48 to 72 hour window.
- A lab report with no collection date or a different name.
- A photo of a card cut off at the edge, or too blurred to read the result.
- A single TST when the client wanted a two-step.
Each one means another round of chasing, and with a skin test it can mean another week.
Keeping TB paperwork moving
The fastest way to avoid a last-minute TB scramble is to ask for TB documentation early, tell candidates precisely what a complete record looks like, and check each document the moment it arrives instead of at final credentialing.
That is the work GettingDocs takes off your team. Amy, our AI assistant, chases candidates for their TB results and other credentials on WhatsApp and email, sent from your agency's own domain and written in your voice. When a file arrives, Amy checks it is readable and is the right document. Blurred photos, cut-off pages and the wrong document are rejected and the candidate is asked again, so a half-photographed skin test card never reaches your credentialing queue. Accepted documents are filed onto the candidate's record in your ATS, with live integrations for Recruit CRM, Crelate, Zoho Recruit and JobAdder. See how this works for healthcare agencies at GettingDocs for healthcare staffing, or browse our ATS integrations.
Key takeaways
- A TB test for employment in healthcare usually means a risk assessment, a symptom screen and either a skin test or a blood test at hire, following CDC guidance.
- Skin tests need a placement and a reading 48 to 72 hours later, and baseline screening is often two-step. IGRAs such as QuantiFERON need one blood draw.
- A chest X-ray is for candidates with a positive result, not a routine screen.
- State rules and client policies can be stricter than CDC guidance, so check the client's requirement and confirm with the CDC and your state TB program.
- Reject incomplete records on arrival, not the week before a start date.
If TB results and other credentials are holding up your start dates, book a call with GettingDocs and see how Amy keeps credential files moving.
Please note: this article is general information, not legal advice, and was correct at the time of writing (October 2026). Rules and guidance change, so please check the latest guidance from the CDC before relying on it.