For Reference laboratories, the telephone number of the referring facility written on the official referral form
will be the contact number used, and any critical results will be reported directly to clinical personnel, or to the referring laboratory. Delta Lab must have a written agreement with the referring laboratory that indicates to whom the reference laboratory reports critical results.

The following are the list of critical results

1. Hematology:

Test Unit Critical Low Critical High
WBC (Adults) *10e9/L ≤ 2.0 ≥ 30.0
WBC (Children) *10e9/L ≤ 3.5 ≥ 30.0
WBC (Neonates) *10e9/L ≤ 5.0 ≥ 30.0
Neutrophils *10e9/L ≤ 0.5
Blasts Present
Hematocrit (Neonates) % ≤ 30 ≥ 70
Hematocrit (Children) % ≤ 20 ≥ 60
Hematocrit (Adults) % ≤ 18 ≥ 60
Hemoglobin (<7w) g/dL ≤ 6.0 ≥ 24.0
Hemoglobin (>7W) g/dL ≤ 6.0 ≥ 20.0
Platelets *10e9/L ≤ 30 ≥ 1000
INR ≥ 5.0
PTT Seconds ≥ 120
Fibrinogen g/L ≤ 0.6
Malaria Smear Positive
Sickle Cell Positive
D-Dimer Ng/mL ≥ 198
Indirect/Direct Coombs Positive

2. Chemistry

Test Unit Critical Low Critical High
Amylase U/L ≥ 200
Bilirubin (<1y) Mg/dL ≥ 15.0
Calcium Mg/dL ≤ 6.5 ≥ 13.0
Calcium, ionized Mg/dL ≤ 3.2 ≥ 6.4
Chloride Mmol/L ≤ 80 ≥ 115
Creatinine (1d-4w) Mg/dL ≥ 1.5
Creatinine (5w-23m) Mg/dL ≥ 2.0
Creatinine (2-11y) Mg/dL ≥ 2.5
Creatinine (12-15y) Mg/dL ≥ 3.0
Creatinine (>16y) Mg/dL ≥ 10.0
FT4 (<50 y) Pmol/L ≥ 100
FT4 (>50Y) Pmol/L ≥ 77
Glucose (<4 w) Mg/dL ≤ 40 ≥ 400
Glucose (≥ 4 W) Mg/dL ≤ 50 ≥ 400
Iron Ug/dL ≥ 350
LDH U/L ≥ 1000
Lipase U/L ≥ 700
Magnesium Mg/dL ≤ 1.0 ≥ 9.0
Phosphorous Mg/dL ≤ 1.0
Potassium Mmol/L ≤ 2.5 ≥ 6.0
Sodium Mmol/L ≤ 120 ≥ 160
Troponin I Pg/mL ≥ 300
Urea Mg/dL ≥ 100
ALT u/L ≥ 400
AST u/L ≥ 400
CK-MB Ug/L ≥ 8

3. TDM

Test Unit Critical Low Critical High
Carbamezapine Ug/mL ≥ 15.0
Digoxin Ng/mL ≥ 4.0
Phenobarbital Ug/mL ≥ 60.0
Phenytoin Ug/mL ≥ 30.0
Valproic Acid Umol/L ≥ 1047
Cyclosporine Ng/mL ≥ 40

4. Immunology

Test Critical Result
Hepatitis A IgM Positive
Toxoplasma IgM Positive
Hepatitis B Core IgM Positive
CMV IgM (Newly infected infants) Positive
HIV Positive
HBs, Ag Positive
HCV Positive
Measles, IgM Positive
Rubella, IgM Positive
Varicella Zoster, IgM Positive
Syphilis Positive

5. Microbiology

Test Critical Result
Clostridium Difficile Toxin Positive
Fungal stain (sterile sites) Positive
Gram stain or culture from cornea, sclera or vitreous fluid Positive
Gram stain or culture from sterile body fluid or tissue collected in surgery Positive
Acid fast smear Positive
Ocular culture Positive culture for aspirate

Positive culture for pseudomonas aeruginosa

Female genital culture Isolation for strep agalactiae from pregnant women
Gonococcal Infection Positive for N.gonorrhoea smear or culture
Trichomonas Positive
Stool Pathogens Salmonella shigella

6. Urinalysis

Test Critical Result
Glucose, urine ≥ 1000 mg/dL
Ketones, urine (Neonates) ≥ 5 mg/dL
Urine casts ≥ 10/LPH or any waxy casts

7. Outsourced Tests

Test Critical Result
NBS Abnormal