Synopsis
Obtain correctly identified venous, culture and arterial specimens with safe sharps practice, contamination control, timely transport and recognition of complications.
- Perform only after training and supervised competency for the specific sampling system; arterial puncture requires additional assessment and local authorisation.
- Match two identifiers to request and labels at the bedside; never pre-label tubes for several patients.
- For routine venepuncture, choose an appropriate vein, use hand hygiene and skin antisepsis, let antiseptic dry, release the tourniquet promptly and fill tubes to local order-of-draw requirements.
Key red flags
Electric pain, paraesthesia, pulsatile flow or distal change requires immediate needle withdrawal, pressure and assessment.
Pain, coolness, pallor, reduced pulse or neurological deficit requires urgent senior or vascular assessment.
Reasoning priorities
Ensure the correct specimen and additive reach the intended test.
Local laboratory order, fill and transport requirements take precedence over memorised tube colours.
Worked reasoning
A febrile hypotensive adult needs immediate antimicrobials and cultures. Peripheral access is difficult; the available adult bottles specify 10 mL each.
- Call for sepsis support and prepare two identified sets, each with one aerobic and one anaerobic bottle. Plan 4 × 10 mL = 40 mL in total while another clinician prepares urgent treatment.
- Reason that cultures before antibiotics improve yield but must not delay urgent antimicrobial treatment; set an attempt limit and escalate access early.
- If obtainable promptly, disinfect skin and bottle septa, let them dry and collect separate peripheral sets with non-touch technique, filling each to its 10 mL marker. Label site/time; urgent antimicrobials must proceed if difficult access prevents prompt completion.
- Verify transport, record antibiotic timing and collection limitations, communicate deterioration and review culture results and possible contamination.
A stable patient needs venous specimens.