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LOINC Code 49497-1: Platelets Estimate (Bld) [#/Vol]

49497-1 is a LOINC code used to identify Platelets Estimate (Bld) [#/Vol] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Platelets. It is commonly used with the system or sample type Bld.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Platelets. It is commonly used with the system or sample type Bld.

When is it used?

  • Used in lab systems, EHRs, and clinical data exchange.
  • May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
  • Status: ACTIVE
  • Order vs observation: Both
  • Method: Estimate

What it does not mean

  • The code identifies the observation or test, not the actual result.

Key facts

Platelets [#/volume] in Blood by Estimate
Platelets
In the Hematology world estimated cell counts have existed for many moons and they are reported either qualitatively or quantitatively and done strictly by blood smear review. Smear Estimated WBC and Platelet counts that aren't just reported as reduced/adequate/many that are actually estimated as a numeric result like an estimate of 4 K/cumm for WBC or 400 K/cumm for platelets. Like doing a retic count by counting so many fields on the smear type of estimate. This Platelet estimate count is a manual quantitative count. We report a number. See laboratory procedureB. Platelet Count Smear Estimate: 1, Use the 100X oil immersion objective. 2. Estimate the average number of platelets per field using 10 different fields, where the RBCs are evenly dispersed. Avoid field in which RBCs strongly overlap as this will falsely increase the platelet estimate. Multiply this result by 20,000 to obtain an approximation of the platelet count. 3. A normal platelet count would show 8-20 plt/field; or one platelet per 10-30 RBCs. 4. NOTE: If platelet clumps or satellitism are seen, an estimate cannot be performed. Notify physician of problem. If indicated advise redraw in the appropriate anticoagulant, sodium citrate (blue-top). Order will need to be placed for a CBC SODIUM CITRATE test. This will automatically order both lav & blue tubes. III. REFERENCES: A. A Color Atlas and Instruction Manual of Peripheral Blood Cells Morphology, by Barbara H. O'Connor, 1984, p. 20. B. Principles and Procedures, Barbara A. Brown, 6th Edition, 1993, p. 104.
#; ABS; absolute; absolutes; Blood; Cnt; Count; Count/volume; CT; estimation; HEMATOLOGY/CELL COUNTS; Number concentration; Number Concentration (count/vol); Platelet; Platelet count; Platelt; Plt; Point in time; QNT; Quan; Quant; Quantitative; Random; Thrb; Thrombocyte; Thrombocytes; WB; Whole blood

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Platelets Estimate (Bld) [#/Vol]Platelets [#/volume] in Blood by EstimatePlatelet # Bld EstPlateletsHEM/BCPlatelet count, BloodNCnc

Frequently asked questions

Code details

Code49497-1
SystemLOINC
Display namePlatelets Estimate (Bld) [#/Vol]
DescriptionPlatelets
Short namePlatelet # Bld Est
ComponentPlatelets
PropertyNCnc
TimingPt
System (specimen)Bld
ScaleQn
MethodEstimate
ClassHEM/BC
Example units10*3/mm3
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.22
Last changed2.73

Consumer names

Platelet count, Blood

Part names

PlateletsNCncPtBldQnEstimateNumber ConcentrationPoint in time (spot)Blood

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

LOINC Code 49497-1 | HealthAssure