Ultrasound, A-scan
General
Synonym/Acronym:
amplitude modulation scan, A-scan ultrasound biometry.
Rationale
To assess for ocular tissue abnormality and to determine the power of the intraocular lens required for replacement in cataract surgery.
Patient Preparation
There are no food, fluid, activity, or medication restrictions unless by medical direction.
Normal Findings
- Normal homogeneous ocular tissue.
Critical Findings and Potential Interventions
N/A
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Citation
Van Leeuwen, Anne M., and Mickey Lynn. Bladh. "Ultrasound, A-scan." Davis's Lab & Diagnostic Tests Davis's Lab & Diagnostic Tests, 11th ed., F.A. Davis Company, 2025. Nursing Central, nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425151/all/Ultrasound_A_scan?q=correction.
Van Leeuwen AMA, Bladh MLM. Ultrasound, A-scan. Davis's Lab & Diagnostic Tests Davis's Lab & Diagnostic Tests. F.A. Davis Company; 2025. https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425151/all/Ultrasound_A_scan?q=correction. Accessed October 1, 2026.
Van Leeuwen, A. M., & Bladh, M. L. (2025). Ultrasound, A-scan. In Davis's Lab & Diagnostic Tests Davis's Lab & Diagnostic Tests (11th ed.). F.A. Davis Company. https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425151/all/Ultrasound_A_scan?q=correction
Van Leeuwen AMA, Bladh MLM. Ultrasound, A-scan [Internet]. In: Davis's Lab & Diagnostic Tests Davis's Lab & Diagnostic Tests. F.A. Davis Company; 2025. [cited 2026 October 01]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425151/all/Ultrasound_A_scan?q=correction.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC
T1 - Ultrasound, A-scan
ID - 425151
A1 - Bladh,Mickey Lynn,
AU - Van Leeuwen,Anne M,
BT - Davis's Laboratory & Diagnostic Tests
UR - https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425151/all/Ultrasound_A_scan?q=correction
PB - F.A. Davis Company
ET - 11
DB - Nursing Central
DP - Unbound Medicine
ER -

Davis's Lab & Diagnostic Tests

