In blood culture the ratio of blood to reagent is
**Core Concept**
The blood to broth ratio in blood cultures is crucial for optimal recovery of microorganisms. This ratio is significant in **microbiology** and **infectious diseases**. The ideal ratio helps in the detection of **pathogens**.
**Why the Correct Answer is Right**
The correct ratio of blood to broth is 1:10, which means for every 1 part of blood, there are 10 parts of broth. This ratio is essential for the **isolation of microorganisms** and prevents the blood from becoming too diluted, which could lead to false-negative results.
**Why Each Wrong Option is Incorrect**
**Option A:** This ratio is too low, potentially leading to **inhibition of microbial growth**.
**Option B:** This ratio is not ideal for blood cultures.
**Option D:** This is not a standard ratio for blood cultures.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the blood to broth ratio is crucial for the **sensitivity of blood cultures**.
**Correct Answer:** C. 1:10