8.3 Non-Blood Specimen Processing

ASCP Medical Laboratory Assistant MLA

Track your progress as you read

Finished sections get a check mark.

1 Introduction & Exam Overview

1.1 About the ASCP MLA Exam 1.2 Eligibility Routes and Study Plan

2 Chapter 2: Orders, Identification & Communication

2.1 Review, Clarification, and Verification of Test Orders 2.2 Patient Identification 2.3 Patient Communication

3 Chapter 3: Collection Procedures

3.1 Patient Assessment and Preparation 3.2 Site Selection 3.3 Tubes, Anticoagulants, and Order of Draw 3.4 Specimen Types for Common Tests

4 Chapter 4: Special Collections, Reactions & Handling

4.1 Special Collection Procedures 4.2 Adverse Collection Reactions 4.3 Specimen Labeling and Immediate Handling

5 Chapter 5: Specimen Acceptability Assessment

5.1 Correct Specimen Type for the Test 5.2 Specimen Quality Assessment 5.3 Labeling Requirements and Rejection Criteria 5.4 Time, Temperature, and Light Handling

6 Chapter 6: Add-on Requests & Special Specimen Types

6.1 Specimen Suitability for Add-on Requests 6.2 Special Specimen Types

7 Chapter 7: Prioritization, Distribution & Transport

7.1 Department Distribution and Prioritization 7.2 Pneumatic Tube System 7.3 External Packaging and Shipment

8 Chapter 8: Specimen Processing Techniques

8.1 Centrifugation 8.2 Aliquoting 8.3 Non-Blood Specimen Processing 8.4 Microbiology Setup and Plating

9 Chapter 9: Slide Preparation & Specimen Storage

9.1 Slide Preparation 9.2 Specimen Storage (Pre- and Post-Testing)

10 Chapter 10: Reagents, Instrumentation & Quality Control

10.1 Reagents, Standards, and Controls 10.2 Analytical Instrumentation 10.3 Quality Control

11 Chapter 11: Critical Values, Results & Inventory

11.1 Critical Value Notification and Documentation 11.2 Result Retrieval and Review 11.3 Inventory Management

12 Chapter 12: Waived & Point-of-Care Testing

12.1 Waived and POC Instrument Operation 12.2 Waived/POC QC, Result Evaluation & Reporting

13 Chapter 13: Laboratory Regulations, Chemical & Fire Safety

13.1 Laboratory Regulations 13.2 Chemical Safety 13.3 Fire Safety

14 Chapter 14: Infection Control & Waste Disposal

14.1 Standard Precautions, PPE & Hand Hygiene 14.2 Biological Safety Cabinets, Sharps & Exposure Control 14.3 Biological and Hazardous Waste Disposal

15 Chapter 15: Equipment, Ethics, LIS & Quality Assurance

15.1 Laboratory Equipment Maintenance 15.2 Professionalism, Ethics & HIPAA 15.3 Laboratory Information System (LIS) Functions 15.4 Quality Assurance and Improvement

8.3 Non-Blood Specimen Processing

Key Takeaways Explain This Topic AI

Match urine collection type (random, clean-catch, 24-hour) to the order; measure and record 24-hour total volume and verify correct preservatives

Handle body fluids with sterile technique when culture is ordered; label every container and maintain chain of identity across multiple tubes

Treat CSF as urgent—prioritize delivery, department routing, and communication; do not delay for batch convenience

Use correct stool and sputum containers; reject leaking specimens that risk exposure and compromise integrity
Last updated: August 2026

8.3 Non-Blood Specimen Processing

Quick Answer: Process non-blood specimens by matching container and collection type to the order , protecting identity and sterility , measuring 24-hour urine total volume with the correct preservative, treating CSF as STAT/urgent , using proper stool and sputum containers, and rejecting leaking containers that endanger staff and invalidate samples.

Blood tubes dominate phlebotomy training, but Domain II expects equal competence with urine, CSF, other body fluids, stool, and sputum. These specimens are often irreplaceable (OR fluids, CSF) or time-critical (culture, cell counts). The MLA’s job is correct receipt, labeling verification, aliquoting when allowed, prioritization, and safe rejection—not diagnostic interpretation.

Urine Processing
Random urine

Common for routine urinalysis , many drug screens (non-forensic), and some chemistry tests.

Transfer promptly from collection cup to UA tube or analyzer cup per SOP to limit bacterial overgrowth and analyte change.

Mix gently before pouring so sediment is representative for microscopic exam.

Note collection time when clinically relevant (e.g., post-dose drug levels).

Clean-catch midstream

Intended to reduce periurethral contamination for urine culture and often for routine UA when infection is suspected.

Requires a sterile container or culture preservative tube.

At processing: do not open longer than necessary; do not dip non-sterile instruments into a culture specimen before plating/setup.

If the cup is grossly contaminated on the exterior, clean per policy without compromising the lid seal; leaking culture cups are rejection candidates.

24-hour (timed) urine

Timed collections support quantitative chemistry (protein, creatinine clearance inputs, electrolytes, cortisol, heavy metals—test-specific).

MLA responsibility Detail
Preservative check Acid, base, or plain jug as ordered—wrong preservative may invalidate the study
Completeness All voids in the period; missing voids → reject/recollect timed study
Total volume Mix thoroughly, measure entire volume, record in LIS (mL or L per policy)
Aliquots Pour well-mixed aliquots for each ordered test; label with volume and collection interval
Safety Some acidified jugs are corrosive—PPE, spill response, never mouth-pipette

Critical: Calculations use total volume . Estimating from a partial jug or “eyeballing” liters destroys quantitative accuracy. If the patient discarded urine or used the wrong jug, process as a failed collection per policy.

Urine culture preservative tubes

Boric acid or other transport tubes stabilize colony counts when delay is expected. Do not use an old non-sterile cup sitting for hours when policy requires a preservative tube—flag and follow micro rejection rules.

Body Fluids (Pleural, Peritoneal, Synovial, Drain Fluids)

Body fluids may be ordered for cell count, differential, chemistry, crystals, and culture —often from the same procedure with multiple tubes.

Labeling

Each tube/syringe labeled at the bedside with two identifiers, source (e.g., left pleural), date/time, and collector.

Multiple tubes: keep order of draw/priority as clinical staff indicate (often culture first to reduce contamination).

Never relabel by guessing which unlabeled syringe is “the culture.”
Sterile handling

Culture portions: sterile containers, minimal opening, prompt delivery to microbiology.

Do not decant culture fluid through non-sterile chemistry cups first if that contaminates the culture aliquot—follow the lab’s split order.

Chemistry/cell count tubes may be anticoagulant-specific (e.g., EDTA for cell counts— confirm local policy ).

Clotting and delay

Some fluids clot quickly; delayed processing ruins cell counts. Prioritize and communicate with hematology/micro as soon as the specimen arrives.

CSF: Urgency Is Non-Negotiable

Cerebrospinal fluid is obtained by lumbar puncture or shunt tap—invasive and often not easily repeated.

Priority action Why
Hand-carry or expedite transport Cell counts and glucose change with delay; organisms may die
Notify receiving departments Micro, hematology, chemistry may all share limited volume
Protect from extreme temperatures Follow lab policy
Do not batch with routine urines CSF is not a “when you get to it” specimen
Volume triage If QNS for all tests, escalate—pathologist/supervisor sets priority

Typical tube numbering (facility-specific; do not invent ):

Tube 1 often chemistry or least contaminated depending on protocol
Intermediate tubes for micro/heme
Last tube sometimes preferred for cell count to reduce traumatic-tap blood

Know your laboratory’s CSF tube allocation chart. The MLA ensures tubes go to the correct benches promptly and that labels stay with the fluid that was drawn.

If a CSF leaks in transport, treat as a major problem: exposure risk, volume loss, possible rejection—notify immediately.

Stool Specimens

Order type Container / notes

Occult blood (FOBT/FIT) Manufacturer card or device; correct patient prep when required; do not use expired cards

Culture Enteric pathogen transport vial as specified; do not use random diaper smear in a non-sterile open cup when a Cary-Blair-type medium is required

C. difficile Soft/liquid stool per policy; formed stool often rejected for toxin/PCR algorithms
O&P Vials with fixative (e.g., formalin/PVA systems) filled to line; ratio matters
Fecal fat / other timed studies Entire collection instructions—follow send-out manual

Reject stool cups that are leaking , unlabeled, or wrong media for the test. Do not transfer leaking stool with bare hands; use PPE and consider recollection in a proper sealed container.

Sputum

Morning deep-cough specimens preferred for many respiratory studies; saliva-only specimens may be rejected by micro quality screens.

Sterile screw-cap containers; tight seal.

Process promptly for culture; refrigeration rules vary by test—follow SOP.

AFB or special studies may need specific volume and paperwork—check orders before discarding “extra” specimen.

Rejection of Leaking Containers

Leaking urine jugs, stool cups, fluid syringes without secure caps, and cracked CSF tubes are biohazard and quality failures .

Why reject / problem-solve Rationale
Staff exposure Standard Precautions; unknown pathogens
Label loss or soak-off Identity risk
Cross-contamination of bags/racks Other patients’ specimens
Volume loss / drying Invalid quantitative or culture results
Regulatory/safety Transport rules violated

Actions:

Do not continue pouring from a leaking primary into clean tubes as if nothing happened without supervisor guidance.

Contain the leak with absorbent pads; PPE on.

Document; notify collecting unit for recollection when the specimen is replaceable.

For irreplaceable fluids, escalate immediately—leadership may salvage remaining sealed portions with documentation.

Disinfect contaminated surfaces and transport bags.

Exterior fecal or urine soil on a closed, intact, properly labeled container may be cleaned and accepted per policy— leak through the seal is different from a dirty outside.

Practical Receipt Checklist (Non-Blood)

Match order ↔ container type ↔ source.

Verify two identifiers and collection data.

Inspect for leaks, cracks, and adequacy of volume.

Apply priority (CSF/STAT fluids first).

Measure 24-hour urine total volume after mixing.

Aliquot only with labeled secondaries and clean technique.

Route to micro/heme/chem with minimal delay.

Reject and communicate clearly when containers fail safety or quality rules.

Key Takeaways

Urine type and preservative must match the order; 24-hour total volume is measured and recorded after thorough mixing.

Body fluids need source-specific labels and sterile handling for culture.

CSF is urgent —expedite, triage volume, never batch as routine.

Stool and sputum require correct devices/media ; quality screens reject saliva-only or wrong-consistency specimens when policy says so.

Leaking containers are safety and integrity problems—contain, document, recollect or escalate.