Understanding the Complete Blood Count (CBC)

A Complete Blood Count is one of the most common blood tests ordered in emergency care — and for good reason. It gives a fast, detailed snapshot of your overall health.

When you’re feeling run down, fighting an infection, or experiencing symptoms like fever, fatigue, or unexplained weakness, a Complete Blood Count (CBC) helps identify what’s going on beneath the surface.

This test is quick, minimally invasive, and highly informative. At First Priority ER in New Braunfels, we run CBC panels daily to help diagnose everything from dehydration to serious infections.

What Does a CBC Measure?

A CBC looks at three main components of your blood: red blood cells, white blood cells, and platelets. Each tells us something important.

• Red blood cells (RBCs): Help carry oxygen through your body. A low count may point to anemia or blood loss.
• White blood cells (WBCs): Fight infection. High or low counts may indicate your immune system is under stress.
• Platelets: Help your blood clot. Low levels may cause bleeding issues, while high levels could point to inflammation or other conditions.

The test also includes values like hematocrit and hemoglobin, which give more context around your oxygen levels and hydration status.

When Is a CBC Ordered?

In the ER, we may run a CBC if you come in with:

• A high fever
• Ongoing fatigue
• Shortness of breath
• Dizziness or lightheadedness
• Signs of infection or inflammation
• Symptoms of anemia, like pale skin or cold hands and feet

Because a CBC can pick up on both acute and chronic conditions, it’s often the first step toward a diagnosis. It helps rule things out — and in many cases, points us in the right direction fast.

Fast, On-Site Lab Testing in New Braunfels

At First Priority ER, we perform CBC tests in-house. That means you won’t have to wait days for results or bounce between locations. Our providers review the data in real time and use it to guide immediate treatment decisions.

If your CBC shows an active infection, we can start antibiotics or fluids on the spot. If it suggests internal bleeding, low oxygen, or another serious issue, we’ll act accordingly, with additional testing or referral if needed.