6.3 Patient Identification and Container Identification
Key Takeaways
- CLSI PRE01 requires positive identification with at least two independent identifiers; room number and bed number are not identifiers.
- Use active identification: ask the patient to state full name and date of birth; do not read the label and accept a nod.
- Label each tube immediately after collection, still in the patient's presence; never pre-label at the desk and walk away.
- A complete label includes the patient's full name, a second unique identifier, collection date and time, and the collector's identification.
- If identifiers on the patient, requisition, and container do not match, do not collect; if already collected, reject and recollect—do not relabel at the bench.
AMT states the first two phlebotomy practices in plain language: identify the correct patient properly, then select appropriate containers and know the requirements for container identification (II.3.B.1–2). The supporting standard on AMT CMLA-REF-2025-1 is CLSI PRE01, Patient and laboratory specimen identification processes (1st edition, 2024). PRE02 tells you how to collect venous blood; PRE01 tells you that a perfect venipuncture on the wrong person, or a correctly drawn tube with the wrong name, is a failed collection. Wrong-blood-in-tube errors drive mistreatment, including transfusion disasters. Identification is not a clerical extra you do if you have time.
Quick Answer: Two independent identifiers, active not passive. Inpatient = band on the patient. Outpatient = patient states name and date of birth, matched to photo ID and requisition. Unconscious = facility temporary ID band, not a guess. Label in the patient's presence after the draw. Mismatch = do not collect or reject. Never relabel at the processing bench to make a tube fit an order.
Two independent identifiers
Positive patient identification uses at least two identifiers that are unique to that person. Typical pairs are:
- Full name plus date of birth (DOB)
- Full name plus medical record number (MRN)
- Full name plus another unique number the facility defines (account number, unique trauma identifier)
Room number, bed number, and diagnosis are not identifiers. They change, they are shared, and they have caused classic mix-ups (two patients named Maria in 412, a transferred patient whose old room is still on the label). A first name alone is not two identifiers. A sticker on the chart, a name on the wall, or a family member calling from the doorway is not the second identifier.
Compare the two identifiers to three things that must agree: the patient (band or stated identity), the requisition or electronic order, and later the container label. If any pair disagrees, stop.
Active versus passive identification
Active identification means the patient states full name and date of birth (or the second identifier your policy uses). You then compare what you heard with the band and the order. Passive identification—reading the name aloud and accepting a nod—is how you draw the roommate who is hard of hearing or the confused patient who agrees with everything. CMLA stems that describe a nod without a stated name are testing this distinction.
Wake a sleeping patient. Do not identify from a chart clipped to the foot of the bed. Ask visitors to pause so you hear the patient, not a helpful relative answering for them, unless policy for pediatric or incapacitated patients names an authorized proxy and the ID band still matches.
Inpatients, outpatients, and unconscious patients
| Setting | How you identify | Hard stop |
|---|---|---|
| Inpatient | Compare two identifiers on the ID band attached to the patient with the requisition; if the patient can speak, have them state name and DOB as well | No band, band on the rail or chart, or band–order mismatch: do not collect; have nursing apply or correct the band |
| Outpatient / ambulatory | Patient states name and DOB; match to photo identification and the requisition or registration record | Photo ID and stated identifiers must match the order; similar names in the waiting room are not close enough |
| Unconscious, unidentified, or fully confused | Use the facility-assigned temporary identity on the band (trauma alias plus unique number) | Do not assign a name from a wallet, a family guess, or a previous admission until registration and nursing have banded that identity |
| Infant / pediatric | Identify from the infant's band, not the bassinet card or the parent's band alone | Parent identity supports consent; it does not replace the child's two identifiers |
Same-name patients are why the unique number exists. Confirm MRN or DOB every time, even if you drew the patient yesterday. If two bands are on one patient, or the band is faded so a digit is unreadable, stop. You are not authorized to pick the identifier that looks more likely.
Unconscious patients in the emergency department often carry a temporary name (for example an alpha-numeric trauma alias). That alias plus the unique number on the band are the two identifiers. When registration later posts a legal name, follow facility relabeling policy; do not quietly overwrite tube labels in processing because you heard the new name in the hallway.
Never pre-label and walk away
CLSI PRE01 and standard phlebotomy practice require labeling in the presence of the patient, at the time of collection, before you leave the bedside or chair. The forbidden pattern is pre-labeling a rack at the nurses' station, drawing several patients, and hoping the names still match the hands that held them.
Why the rule is rigid:
- Pre-labeled tubes get carried into the wrong room.
- A draw that is unsuccessful still leaves a labeled empty tube that someone may fill later from a different patient.
- Batch-labeling two John Smiths is an error you cannot see until a critical value lands on the wrong chart.
Label after blood is in the tube, still at the side of the patient, while you can still ask the patient to look at the label (when able) or while you can still read the band. Do not take unlabeled tubes to the hallway, the elevator, or the processing bench. An unlabeled tube in transit is an unidentified specimen; it is not a time-saver.
Do not label before the stick either, then leave the labeled tubes on the tray while you search for a vein on a second patient. The sequence is: identify, collect, label this patient's tubes, complete the encounter, then move.
What a complete container label contains
Facility information systems print most fields, but the CMLA still names what must be there. A complete blood-container identification typically includes:
| Label element | Why it is required |
|---|---|
| Patient full name | First identifier |
| Second unique identifier (MRN, DOB, or facility unique number) | Second identifier; name alone is not enough |
| Date of collection | Ties the result to a clinical moment |
| Time of collection | Timed tests, therapeutic-drug levels, fasting status, and stability clocks |
| Collector identification (initials, employee ID, or barcode of the collector) | Accountability and follow-up if a mix-up or needlestick occurs |
Some laboratories also encode specimen type, source, or priority (STAT) in the barcode. Handwritten additions must be legible and must not cover the barcode. Do not add a room number as if it were an identifier. If the printer fails, write the same required elements; do not send a tube with only a first name and a room.
The requisition (paper or electronic order) must show the same two identifiers plus the tests. The tube does not have to list every assay, but it must unambiguously belong to that order. If you cannot make the label match before you leave the patient, you do not have a complete container.
Select the appropriate container
Container identification starts with container selection. The right name on the wrong additive is still the wrong specimen.
Match the laboratory directory or collection guide:
- EDTA (lavender) for CBC and other hematology whole-blood tests
- Sodium citrate (light blue), filled to the mark, for PT, aPTT, INR
- Serum tube (red) or SST (gold/tiger) when the method needs serum
- Lithium heparin or PST (green/light green) when the method needs plasma chemistry
- Fluoride/oxalate (gray) when the order requires a glycolytic inhibitor
- Blood-culture bottles, trace-element tubes, or other specialty containers only when ordered
Expired tubes, cracked tubes, and tubes that have lost vacuum are not appropriate containers. Pediatric or partial-draw tubes are appropriate only when the fill volume still meets the additive ratio the test requires. Chapter 7 covers order of draw and short-draw physics; here the rule is: choose the container the assay is validated for, then put the patient's identifiers on that container.
Tube versus requisition mismatch
If identifiers disagree before the stick—wrong name on the order, band does not match the requisition, outpatient photo ID does not match the labels—do not collect. Resolve identity with nursing, registration, or the ordering location. Collecting anyway and adding a comment is how wrong-blood-in-tube events are born.
If identifiers disagree after collection—tube label does not match the requisition, two patients' tubes are in one bag, a tube is unlabeled, or a tube is labeled with room number only—reject. Recollect with correct identification. Do not:
- Relabel the tube at the processing bench to match the paperwork
- Pour the blood into a correctly labeled spare tube
- Assume the room number proves which requisition is right
- Call the floor and change the requisition to match a tube you already like
Blood-bank and legal specimens (Chapter 8) add stricter chain-of-custody rules; the foundation is the same: unmatched identity is not repaired with a marker.
In practice
You enter 412-A with a requisition for Jordan Lee, DOB 3 March 1959, MRN 008812. The band on the patient in the bed reads Jordan Lee, DOB 3 March 1949, different MRN. The roommate's band matches your requisition. You do not draw the person in the bed you were pointed to. You do not rely on the room number. You stop, identify the patient whose band matches both identifiers on the order, and report the near miss.
You finish an outpatient draw, then realize the last gold-top has no printed label because the printer skipped. You do not walk it to processing to add the name later. You complete a full handwritten or reprinted label at the chair, with the patient still present, including name, second identifier, date, time, and your identification.
Exam traps
- Room or bed number is never a CLSI identifier.
- A nod is not active identification.
- Pre-labeling at the desk is always wrong, even on a busy morning list.
- An ID band on the rail, chart, or bassinet is not on the patient.
- Mismatch is do-not-collect or reject—not relabel, not comment-and-send.
- Correct patient plus wrong additive is still the wrong container.
When CMLA asks how you identify, answer with two identifiers, the band or the stated identity, labeling in the patient's presence, and a hard stop on mismatch.
Which practice meets CLSI PRE01-style positive patient identification for a blood draw?
When should blood-collection tubes be labeled?
A filled EDTA tube is labeled with a name and date of birth that do not match the attached requisition. What is the correct CMLA action?