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Test Code PCYG Cytogenetics (Constitutional Chromosomal Karyotyping)

Important Note

All specimens should be shipped to the lab within 12 - 24 hours of collection. Specimen received after 48 hours of collection will nonetheless be processed but results may be compromised. For overseas specimens, avoid shipping on Friday or eve of public holidays.

Additional Codes

Epic Ordering Code  LAB3040862
NBS Code LBA00330
Service Code 1682103

Specimen Requirements

Submit one of the following:

 

Fresh specimen required

 

For (A):

Preferred: Acceptable:
15 ml Sterile Collection Tube Sterile Universal Container

(A) Specimen Type: Amniotic Fluid

      Volume: 20.0 mL

      Storage/transport requirements: Ambient

 

For (B) to (D):

Preferred:
Sterile tube with 10.0 mL collection media


(B) Specimen Type: Chorionic Villi

      Amount: ~25.0 mg

      Storage/transport requirements: Ambient

(Prearrange with Cytogenetics Laboratory for collection media)

 

(C) Specimen Type: Product of Conception [villi from placenta (preferred), achilles tendon or skin]

      Storage/transport requirements: Ambient

(Prearrange with Cytogenetics Laboratory for collection media)

 

(D) Specimen Type: Skin Biopsy / Other Tissues

      Storage/transport requirements: Ambient

(Prearrange with Cytogenetics Laboratory for collection media)

 

For blood specimen (E) to (G):

Preferred: Acceptable:
Green Top (Na Heparin) Green Top (Li Heparin)

E) Specimen Type: Foetal Blood

     Volume: 1.0 - 2.0 mL

     Storage/transport requirements: Ambient

 

(F) Specimen Type: Peripheral Blood

      Volume: 4.0 mL

      Storage/transport requirements: Ambient

     

(G) Specimen Type: Cord Blood

      Volume: 4.0 mL

      Storage/transport requirements: Ambient

 

Collection Instructions: Send specimen with completely filled Informed Consent Form for Prenatal and Postnatal Chromosomal Karyotyping/FISH.

Specimen Stability

Fresh specimen required

Specimen Type Ambient Refrigerate
Amniotic Fluid 12 – 48 hours –
Chorionic Villi 12 hours (preferred) 12 – 48 hours
Foetal Blood 12 hours (preferred) 12 – 48 hours
Peripheral Blood 12 hours (preferred) 12 – 48 hours
Cord Blood 12 hours (preferred) 12 – 48 hours
Product of Conception 12 hours (preferred) 12 – 48 hours
Skin Biopsy / Other Tissues 12 hours (preferred) 12 – 48 hours

 

 

 

 

 

 

 

 

 

Specimen Condition

Blood

Haemolysis Alert
Icterus OK
Lipaemia OK
Others (Clotted or Frozen) Reject

Skin Biopsy / Fluid / Other Tissues

Haemolysis Not applicable
Icterus Not applicable
Lipaemia Not applicable
Others (Frozen, air-dry or formalin fixed tissues) Reject

Methodology

Cell culture followed by chromosome analysis.

Days and Times Performed

Monday through Saturday (Office hours only).

 

Specimen Type TAT
Amniotic Fluid / Chorionic Villi 14 days
Foetal Blood / Cord Blood 14 days
Peripheral Blood  28 days
Product of Conception 28 days
Skin Biopsy / Other Tissues 6 weeks

 

 

 

 

 

 

 

Reference Interval

An interpretative report will be provided.

Testing Laboratory

National University Hospital
Cytogenetics, 67722512

Useful For

Detection of structural and numerical chromosome abnormalities.

Update

Last updated 09/06/2026

LOINC Code Information

48818-9

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