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Items starting with L

Lactate

Lactate

<16yrs   0.6-2.5 mmol/L    (Source : Pathology Harmony Recommendations)

Adult      0.5-2.2 mmol/L   (Source : Abbott Diagnostics)

CSF lactate-age related: 

  • Neonates (<=28 days):  0.9 - 2.5 mmol/L (direct from Leen et al. PLOS One)
  • Infants & Children (>28 days - <19 years): 1.0 - 2.2 mmol/L (combined from Leen et al. PLOS One 2012)
  • Adults (>=19 years): 1.1 - 2.4 mmol/L (combined from Leen et al. PLOS One 2012)

Lactate dehydrogenase (LD) Isoenzymes

Lactate Dehydrogenase (LDH)

Lactate Dehydrogenase (LDH)

125-220 IU/L (Enzyme activity not reported on haemolysed samples)

Source : Abbott Diagnostics

http://www.labtestsonline.org.uk/understanding/analytes/ldh/tab/glance

Lamotrigine (Lamictal)

Lamotrigine (Lamictal)

3-15mg/L  NOTE: change to therapeutic range from February 2026, single range for all treated patients 

Laxative Screen

Interpretation advice from referral laboratory

http://www.toxlab.co.uk/frmain.htm

LDL Cholesterol (calculated)

LDL Cholesterol (calculated)

Less than 3.3 mmol/L

http://www.labtestsonline.org.uk/understanding/analytes/ldl/tab/glance

Lead

Lead

Normal values: <0.24 umol/L

Desirable values in children: <0.24 umol/L

Occupational Certification Limit for women of reproductive capacity: 1.45 umol/L

Occupational Certification Limit for males (age 18+): 2.90 umol/L

INDUSTRIAL EXPOSURE

  

Repeat within 12 months

< 1.4

Repeat within 6 months

> 1.4 – 1.9

Repeat within 3 months

> 1.9 – 2.4

Repeat within 3 months

> 2.4 – 2.9

At doctors discretion but not more than 3 months

> 2.9

Please note that the normal values have been decreased as of 2018 to bring us in-line with CDC recommendations.

Legionella urine antigen

Legionella urine antigen

Leishmania PCR, Microscopy & Culture

Leishmania PCR, Microscopy & Culture

Hospital of Tropical Diseases, London

Leishmania Serology

Leishmania Serology

Not applicable

Leptospiral Serology

Leptospiral Serology

Leucocyte Enzymes (White cell enzymes - galactosidases, hexosaminidase, arylsulphatase etc)

Leucocyte Enzymes (White cell enzymes - galactosidases, hexosaminidase, arylsulphatase etc)

Provided by reference laboratory

http://www.pinboard.in/u:duty_biochemist/t:BCH/

Levetiracetam (Keppra)

Levetiracetam (Keppra)

Therapeutic range 10-40 mg/L

Renal excretion means that the plasma half-life is longer in the elderly. Dose reduction is necessary at GFR < 60 mL/min/1.73 m2.

Linezolid Assay

Linezolid Assay

Linezolid Assay

Linezolid Assay

Lipase

Lipase

5.6 – 51.3 IU/L in serum

 

https://pinboard.in/u:duty_biochemist/t:pancreatitis/

Lipoprotein a (Lp (a))

Lipoprotein a (Lp (a))

Increased coronary risk over 75 nmol/L.

Lipoprotein a (Lp(a)) Genotyping (LIPOAG)

Lipoprotein a (Lp(a)) Genotyping (LIPOAG)

Interpretative comments will be attached to report.

http://www.nejm.org/doi/full/10.1056/NEJMoa0902604 http://jama.jamanetwork.com/article.aspx?articleid=184063

Lipoprotein Lipase (post heparin)

2-12 umol/mL/hr

Lipoprotein X (LpX)

Lipoprotein X (LpX)

Provided by referral laboratory

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