L Tests

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Lanoxin (See Digoxin)

LDH

  • Test Name: LDH
  • Laboratory: Biochemistry
  • Specimen Type: Serum, plasma
  • Specimen Container: Yellow, green for WRH in house samples only.
  • Specimen Volume: 4mls
  • Specimen Requirements: Unspun overnight samples are unsuitable
  • Other details: N/A
  • Frequency of analysis/ assay:
  • Turnaround Time: Routine - 2 working day Urgent <3 hours
  • Phone alert limits: N/A
  • Preanalytical stability at room temp:

Lead

  • Test Name: Lead
  • Laboratory: Biochemistry Referred Test
  • Specimen Type: EDTA whole blood
  • Specimen Container: Purple
  • Specimen Volume: 4mls
  • Specimen Requirements: N/A
  • Other details: Send separate request form and sample.
  • Frequency of analysis/ assay:
  • Turnaround Time: 3 weeks
  • Phone alert limits: N/A
  • Preanalytical stability at room temp:

 

Lebers Hereditary Opic Neuropathy

 

  • Test Name: Lebers Hereditary Opic Neuropathy
  • Laboratory: Misc External Referral
  • Specimen Type: EDTA & Litium Heparin
  • Specimen Container: Purple & Green
  • Specimen Volume:
  • Specimen Requirements:
  • Other details:
  • Frequency of analysis/ assay:
  • Turnaround Time:
  • Phone alert limits:
  • Preanalytical stability at room temp:

 

Legionella Antibodies

 

  • Test Name: Legionella Antibodies
  • Laboratory: Serology External
  • Specimen Type: Clotted Blood Specimen
  • Specimen Container: Yellow, white (paediatric).
  • Specimen Volume: 4ml clotted blood (1.5ml paediatric).
  • Specimen Requirements: Refrigerate if delivery to the laboratory is delayed.
  • Other details:n/a
  • Frequency of analysis/ assay: Referred to external test site
  • Turnaround Time: 14 days
  • Phone alert limits: N/A
  • Preanalytical stability at room temp: N/A

 

Legionella pneumophila see Respiratory tract infections - Lower see Urinary Antigen Testing

 

Leptospirosis (Weil's disease)

 

  • Test Name: Leptospirosis (Weils disease)
  • Laboratory: Serology External
  • Specimen Type: Clotted Blood Specimen
  • Specimen Container: Yellow, white (paediatric).
  • Specimen Volume:4ml clotted blood (1.5ml paediatric).
  • Specimen Requirements: Refrigerate if delivery to the laboratory is delayed.
  • Other details: N/A
  • Frequency of analysis/ assay: Referred to external test site
  • Turnaround Time: 7-10 days
  • Phone alert limits: Specimens positive for Leptospirosis will be phoned to the requesting clinician.
  • Preanalytical stability at room temp: N/A

 

LFT

 

  • Test Name: LFT (ALT, Total Bilirubin, Alkaline Phosphatase, GGT, Total Protein, Albumin)
  • Laboratory: Biochemistry
  • Specimen Type: Serum, plasma
  • Specimen Container: Yellow, green for WRH in house samples only.
  • Specimen Volume: 4mls
  • Specimen Requirements: N/A
  • Other details: N/A
  • Frequency of analysis/ assay: Daily
  • Turnaround Time: Routine - 2 working day Urgent <3 hours
  • Phone alert limits:
  • Preanalytical stability at room temp:

 

LH

  • Test Name: LH
  • Laboratory: Biochemistry
  • Specimen Type: Serum, plasma
  • Specimen Container: Yellow, green for WRH in house samples only.
  • Specimen Volume: 4mls
  • Specimen Requirements:
  • Other details: See Reference Ranges
  • Frequency of analysis/ assay: Daily
  • Turnaround Time: 3 working days
  • Phone alert limits: N/A
  • Preanalytical stability at room temp: 7 days

 

Lipoprotein Profile

 

  • Test Name: Lipoprotein Profile
  • Laboratory: Biochemistry Referred Test
  • Specimen Type: Serum
  • Specimen Container: Yellow
  • Specimen Volume: 4mls
  • Specimen Requirements: Patient should be fasting for 16 hours. Clinical details should be provided.
  • Other details: Send separate request form and sample.
  • Frequency of analysis/ assay:
  • Turnaround Time: 3 weeks
  • Phone alert limits: N/A
  • Preanalytical stability at room temp:

 

Listeriosis

  • Test Name: Listeriosis
  • Laboratory: Microbiology
  • Specimen Type: Placenta / Placental swab
  • Specimen Container: Sterile universal container, amies swab.
  • Specimen Volume: As large a tissue sample as possible should be sent
  • Specimen Requirements: Refrigerate if delivery to the laboratory is delayed.
  • Other details: N/A
  • Frequency of analysis/ assay: Daily
  • Turnaround Time: 2-4 days
  • Phone alert limits: Specimens positive for Listeria will be phoned to the requesting clinician
  • Preanalytical stability at room temp: N/A

 

Lithium

 

  • Test Name: Lithium
  • Laboratory: Biochemistry
  • Specimen Type: Serum Only
  • Specimen Container: Yellow Only
  • Specimen Volume: 4mls
  • Specimen Requirements: Specimen should be taken 12 hours after last dose. Note: Lithium heparin plasma is unsuitable
  • Other details: N/A
  • Frequency of analysis/ assay: Daily
  • Turnaround Time: Routine - 2 working day. Urgent ( ? Toxicity) < 3 hours
  • Phone alert limits: >1.5 mmol/L
  • Preanalytical stability at room temp:

 

Lupus Anticoagulant

 

  • Test Name: Lupus Anticoagulant
  • Laboratory: Haematology
  • Specimen Type: Trisodium Citrate
  • Specimen Container: Blue
  • Specimen Volume: 3 x 3ml or 6 x 3ml for full Thrombophilia screen
  • Specimen Requirements: Inadequately filled tubes cannot be used.
  • Other details: The following tests are recommended for the investigation of Antiphospholipid Antibody Syndrome: Lupus Anticoagulant ( 3 x coag. samples to Haematology Lab), Anti Cardiolipin and Anti β Glycoprotein I antibodies ( 1 x clotted sample to Histology Lab). Separate request forms are required.
  • Frequency of analysis/ assay: Samples are frozen and done in batch analysis
  • Turnaround Time: 4-6 weeks
  • Phone alert limits: n/a
  • Preanalytical stability at room temp: Specimens should ideally be processed within 4 hours of collection. Please send to the laboratory ASAP.

 

Lyme serology ( B.burdorferi)

 

  • Test Name: Lyme serology ( B.burdorferi)
  • Laboratory: Serology External
  • Specimen Type: Clotted Blood Specimen
  • Specimen Container: Yellow, white (paediatric).
  • Specimen Volume: 4ml clotted blood (1.5ml paediatric).
  • Specimen Requirements: Refrigerate if delivery to the laboratory is delayed.
  • Other details: N/A
  • Frequency of analysis/ assay: Referred to external test site
  • Turnaround Time: 7-10 days
  • Phone alert limits: Specimens positive for B.burdorferi will be phoned to the requesting clinician
  • Preanalytical stability at room temp: N/A

 

Lysozyme

  • Test Name: Lysozyme
  • Laboratory: Haematology Referral Test
  • Specimen Type: Serum
  • Specimen Container: Yellow
  • Specimen Volume: 10mls
  • Specimen Requirements: Do not send Fridays
  • Other details: Sample suitable for 30 hours.
  • Frequency of analysis/ assay: Referred to external test site
  • Turnaround Time: < 4 weeks
  • Phone alert limits: N/A
  • Preanalytical stability at room temp: 1 day