Zendesk uses strictly necessary cookies for security purposes. Click here for more information

Articles in this section

See more

More about Cq values and virus test results

Avatar
Customer Support
Updated
Follow

The “Cq” in Cq value stands for “Cycle quantification”. It is a number that indicates when (or in which cycle of processing) the virus was detected in your sample. 

Using your Cq number and some control sample data for the test, the test manufacturer can calculate an overall ‘detected', ‘not detected' or ‘inconclusive' result.  This logic varies depending on the manufacturer of your test: you can find this in the ‘Test name' field of your result details.

 

Test Name

Virus Detected

Virus Not Detected

Virus Inconclusive - Sample

Inconclusive - Test Run

IFU link
FRANKD

5 <= Cq value <= 30

(Cq value is between 5 and 30 inclusive)

0 <= Cq value < 5 (Cq value is greater or equal to 0 AND less than 5); OR

Cq value empty

 NA
  1. Cq value < 0 (Cq is less than 0); OR
  2. Cq value > 30 (Cq is more than 30); OR
  3. Control sample -ve != 0 (the negative control sample does not equal 0); OR
  4. Control sample -ve != empty (the negative control sample is not empty); OR
  5. Control sample +ve = empty (the positive control sample is empty); OR
  6. Control sample +ve > 30 (the positive control sample is over 30); OR
  7. Control sample +ve < 1 (the positive control sample is less than 1)

here
SAVD

0< Cq value <=30


(Cq value is greater than 0 AND less than or equal to 30)

 Cq value "NaN" OR Cq value = 0 NA
  1. Cq value < 0 (Cq is less than 0); OR
  2. Cq value > 30 (Cq is more than 30); OR
  3. Control sample -ve != 0 (the negative control does not equal 0); OR
  4. Control sample -ve != "NaN" (the negative control sample is not NaN); OR
  5. Control sample +ve = 0 (the positive control sample is 0); OR
  6. Control sample +ve = "NaN" (the positive control sample is NaN); OR
  7. Control sample +ve >= 30 (the positive control sample is more than 30); OR
  8. Control sample +ve <= 1 (the positive control sample is less than or equal to 1)

here
PROmate

BOTH

0 < Cq value < limit (the Cq value is between 0 and the limit), where the limit is the lower out of 34.71 OR Control sample -ve - 5 (the negative control sample minus 5)

AND

The Cq Hex value can be any value, provided that the test has valid positive and negative controls.

BOTH

Cq value = Empty OR Cq value >= 37.66 (the Cq value is empty or is higher than 37.66)

AND

1 < Cq value (HEX) < 22 (the Cq HEX value is between 1 and 22)

1. limit < Cq value <= 37.66 (the Cq value is between the limit, inclusive, and 37.66), where limit is the lower out of 34.71 OR Control sample -ve - 5 (the negative control sample minus 5); OR

2. Cq value (HEX) = Empty; OR

3. BOTH
a. Cq value = Empty OR Cq value >= 37.66 (the Cq value is empty or is higher than 37.66); AND
b. Cq value (HEX) <= 1 OR Cq value (HEX) > 22 (the Cq HEX value is lower than 1 or empty or higher than 22)

1. Control sample +ve <14 or Control sample +ve > 25 (the positive control sample is less than 14 or more than 25): OR

2. Control sample -ve (HEX) = 0 (the negative control sample is 0); OR

3. BOTH
a. Control sample +ve = 0 (positive control sample is 0); AND
b. Control sample +ve (HEX) >= 22 (positive control sample HEX is equal to or above 22)

 here

Related articles