8.5 Non-Blood Specimen Collection & Patient Instruction

8.5 Non-Blood Specimen Collection & Patient Instruction

Quick Answer: DTP tasks 3.17 (instruct the patient in proper collection and preservation of non-blood specimens) and 3.18 (collect non-blood specimens per requirements) are both in the 30%-weighted collection domain. The controlling theme is that most non-blood specimens are collected by the patient, which makes your instruction the actual collection technique.

Urine Specimens

Urine is the most frequently collected non-blood specimen, and the collection method is dictated by the test.

The Clean-Catch Midstream Technique

Contamination with perineal and urethral flora is what makes an uninstructed urine culture uninterpretable. The exam expects you to know the instruction:

1. Wash hands.
2. Cleanse the area with the provided antiseptic towelettes. Female patients separate the labia and cleanse front to back, using a fresh towelette for each pass. Male patients retract the foreskin if uncircumcised and cleanse the glans.
3. Begin voiding into the toilet. The initial stream flushes the distal urethra of resident flora.
4. Without stopping the stream, position the sterile container and collect the middle portion.
5. Finish voiding into the toilet.
6. Cap the container without touching the inside of the container or lid.
7. Label with two identifiers, the date, and the time of collection.

[!IMPORTANT] The specimen is collected midstream, not from the beginning of the stream. This single detail is the difference between a diagnostic culture and a contaminated one, and it is the most commonly tested point in this section.

The 24-Hour Urine Collection

The most common failure is a patient who includes the first void, which contains urine produced before the collection period began.

1. On day one at a noted start time, the patient voids and discards that urine, recording the start time.
2. Every subsequent void for the next 24 hours is collected into the container.
3. At exactly 24 hours, the patient voids one final time and adds it to the container.
4. The container is kept refrigerated or on ice throughout unless a preservative dictates otherwise.

Provide written instructions, and verify understanding with teach-back. Warn the patient that any missed void invalidates the entire collection and must be reported so it can be restarted. Many 24-hour containers hold an acid or other preservative — the patient must be warned not to touch it, not to void directly into the container when a preservative is present, and not to discard it.

Stool Specimens

• Occult blood testing may require dietary restriction for several days beforehand — typically avoiding red meat, certain vegetables, vitamin C, and NSAIDs, depending on the method. Guaiac methods have dietary restrictions; immunochemical (FIT) methods generally do not.
• Ova and parasites require the specimen in a preservative vial, often as a series of specimens on separate days.
• Culture requires a sterile container and prompt transport.
• The specimen must not be contaminated with urine or toilet water, so the patient collects into a clean dry container or a collection hat placed in the toilet, then transfers with the provided scoop.
• Specimens are labeled with the date and time of passage.

Sputum Specimens

The universal error is that patients produce saliva rather than sputum.

• Explain that you need material coughed up from deep in the chest, not spit from the mouth.
• Best collected on rising in the morning, when overnight secretions have accumulated.
• The patient should rinse the mouth with water first — not mouthwash, which is antibacterial — to reduce oral flora.
• Take several deep breaths, then a deep, forceful cough directly into the sterile container.
• For acid-fast bacilli (tuberculosis) testing, specimens are typically collected on consecutive days, and collection is performed in a designated space with appropriate respiratory protection.
• Transport promptly; refrigerate if delayed.

[!WARNING] Collecting sputum is an aerosol-generating activity. For suspected tuberculosis, Airborne Precautions apply: a fit-tested N95 or higher respirator and, ideally, an airborne infection isolation room or designated booth. Never have a patient cough into a specimen cup in an open waiting area.

Culture Swabs

All swabs go into the appropriate transport medium immediately, and the site is documented on the label — "wound" is not a site; "left lateral ankle ulcer" is.

Labeling and Documentation Apply Equally

Non-blood specimens are patient specimens and require the identical rigor:

• Two patient identifiers on the container, never on the lid, since lids are removed and swapped.
• Date and exact time of collection.
• Collector or "patient collected" as applicable.
• Source or site for cultures and body fluids.
• Prompt transport in a sealed biohazard bag with the requisition in the outer pocket.

[!IMPORTANT] Label the container, not the lid. This is the single most common non-blood labeling error, and it produces an unidentifiable specimen the moment the lid comes off.