KDP categories · Top KDP authors
Diagnostics & Labs: Amazon KDP category data
Amazon Books Best Sellers data for Diagnostics & Labs, updated Nov 2, 2026: median price $77.63, median 39 reviews, average rating 4.6 and a KDPTop opportunity score of 32/100 (highly competitive).
| Price range (middle 50%) | $37.31 – $119 |
|---|---|
| Average rating | 4.6 |
| New releases (90 days) | 8% |
| Books on the list | 100 |
| Store | Books |
What stands out
- Its median reviews are 12% of the parent category Medicine (338), one of the easier corners under it.
- At $77.63 its median price beats 99% of Books categories, leaving more margin per copy.
- Prices spread wide: the middle half runs from $37.31 to $119, so budget editions and premium or boxed sets sell side by side.
Top 10 Diagnostics & Labs best sellers
-
Phlebotomy Essentials
by Ruth E. McCall
- List rank#1
- Price$85.87
- Rating4.7
- Reviews314
-
Examination Review for Ultrasound: Abdomen and Obstetrics & Gynecology
by STEVEN M. PENNY MA RT(R)) RDMS
- List rank#2
- Price$94.48
- Rating4.6
- Reviews236
-
Routine Lab Values Made Ridiculously Simple
- List rank#3
- Price$29.95
- Rating4.3
- Reviews28
-
Mosby's Comprehensive Review of Radiography: The Complete Study Guide and Career Planner
by William J. Callaway MA RT(R)
- List rank#4
- Price$85.99
- Rating4.8
- Reviews321
-
Critical Care and Hospitalist Medicine Made Ridiculously Simple
by Michael Donahoe M.D.
- List rank#5
- Price$59.95
- Rating4.7
- Reviews748
-
Lab Values: Everything You Need to Know about Laboratory Medicine and its Importance in the Diagnosis of Diseases: Second Edition
- List rank#6
- Price$18.99
- Rating4.4
- Reviews1,361
-
Acid-Base, Fluids, and Electrolytes Made Ridiculously Simple: Color Edition
by Richard A. Preston M.D.
- List rank#7
- Price$27.95
- Rating4.7
- Reviews456
-
Vascular Technology: An Illustrated Review
by RN Rumwell, Claudia
- List rank#8
- Price$99.95
- Rating4.8
- Reviews333
-
Phlebotomy Notes: Pocket Guide to Blood Collection
by Susan King Strasinger
- List rank#9
- Price$37.61
- Rating4.8
- Reviews1,020
-
Textbook of Diagnostic Sonography: 2-Volume Set
by Sandra L. Hagen-Ansert MS RDMS RDCS FASE FSDMS
- List rank#10
- Price$338
- Rating4.8
- Reviews57
Subcategories
FAQ
Is Diagnostics & Labs a good niche for Amazon KDP?
Its KDPTop opportunity score is 32/100, which makes it highly competitive. The median best seller has 39 reviews and sells for $77.63.
How many reviews do you need to rank in Diagnostics & Labs?
The median best seller has 39 reviews, and 67% of them have fewer than 100.
What do Diagnostics & Labs best sellers cost?
The median price is $77.63; half of the best sellers are priced between $37.31 and $119.
Can new books break into Diagnostics & Labs?
8% of the current best sellers were released in the last 90 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.