12/26/2025
💉 Angles & Routes of Injections (ID → SC → IM → IV)|| Angeles & Routes of Injections 💉💉
🧴 Intradermal (ID)
➡️ Layer: Epidermis → Dermis (very superficial)
➡️ Angle: 📐 10–15°
➡️ Purpose: TB (Mantoux) test → Allergy testing
➡️ Volume: 💧 0.1 mL (standard)
➡️ Needle: 25–27 gauge → short → fine bevel
➡️ Technique:
→ Bevel up
→ Insert just under skin surface
→ ✔️ Small wheal/bleb should appear
➡️ Common sites:
→ Inner forearm
→ Upper back (scapular area)
➡️ Absorption: 🐢 Slow (minimal vascularity)
💛 Subcutaneous (SC)
➡️ Layer: Dermis → Subcutaneous fat
➡️ Angle: 📐 45° (thin patient) → 90° (adequate adipose tissue)
➡️ Purpose: Insulin → Heparin → Some vaccines/biologics
➡️ Volume:
→ 0.5–1 mL typical
→ ⚠️ Up to 2 mL in adults (site & policy dependent)
➡️ Needle: 25–30 gauge → short
➡️ Technique:
→ Skin may be pinched
→ Do not aspirate (insulin, heparin)
➡️ Common sites:
→ Abdomen (preferred for insulin)
→ Outer upper arm
→ Anterior thigh
→ Upper buttocks
➡️ Absorption: ⏳ Moderate
→ Slower than IM → Faster than ID
💪 Intramuscular (IM)
➡️ Layer: Subcutaneous tissue → Muscle
➡️ Angle: 📐 90°
➡️ Purpose: Vaccines → Antibiotics → Analgesics → Hormones
➡️ Volume (site-dependent):
→ Deltoid: ≤ 1 mL (occasionally up to 2 mL)
→ Ventrogluteal: 3–5 mL (preferred for large volumes)
→ Vastus lateralis:
→ Adults: 2–3 mL
→ Infants/children: ✔️ preferred site
➡️ Needle: 20–25 gauge → longer length
➡️ Technique:
→ Skin stretched taut
→ Insert quickly at 90°
➡️ Absorption: ⚡ Fast
→ Depends on muscle perfusion & activity
🔴 Intravenous (IV)
➡️ Layer: Directly into a vein
➡️ Angle: 📐 15–30° (≈ 25° as shown)
➡️ Purpose:
→ Rapid drug administration
→ Fluids → Blood products → Emergency meds
➡️ Volume:
→ Varies widely (bolus to continuous infusion)
➡️ Needle/Catheter:
→ IV cannula (18–24 gauge, site dependent)
➡️ Technique:
→ Bevel up
→ Advance until blood flashback
→ Lower angle → advance catheter → remove needle
➡️ Absorption: 🚀 Immediate (100% bioavailability)..See more...💉💉💉🩺🧑🏻⚕️