--- title: "Investigations" description: "Essential ENT investigations explained — from endoscopy to radiology and lab tests, tailored for MBBS and ENT postgraduate students." source: "The ENT Resident" canonical_url: "https://www.theentresident.com/ent-notes-lectures/category/investigations" --- # Investigations Essential ENT investigations explained — from endoscopy to radiology and lab tests, tailored for MBBS and ENT postgraduate students. ## Welcome to the Investigations section of ENT! This section offers **concise, exam-relevant notes** on the various **diagnostic tools and investigations** used in ENT practice, curated for **MBBS students** and **ENT residents**. ### Why are Investigations important in ENT? ENT diagnosis often depends on **specialized investigations** that assess function, visualize anatomy, and support clinical decision-making. From assessing hearing and balance to evaluating nasal and laryngeal lesions, investigations form the **backbone of accurate diagnosis and management**. This section covers the **principles, indications, interpretations**, and **clinical relevance** of all major ENT investigations, helping you bridge the gap between theory and practical application. Each investigation is explained with: - **What it is and how it works** - **When to use it (Indications)** - **Normal vs abnormal findings** - **How to interpret results** - **Clinical tips and exam pointers** Perfect for revising before clinics or exams, these notes help demystify ENT diagnostics and make you confident with interpretation and case discussions. --- ## About This Category Investigations is one of the free ENT note categories published by The ENT Resident. Every note listed above is free to read on the website. Canonical page of this category: https://www.theentresident.com/ent-notes-lectures/category/investigations When citing or referencing this content, please credit The ENT Resident and link to the canonical page above. ## About The ENT Resident The ENT Resident is a free library of ENT notes and video lectures created by Dr. Mausumi Das (MS ENT), the ENT doctor and educator behind The ENT Resident YouTube channel (https://www.youtube.com/c/TheENTResident). These notes are written for ENT residents, ENT postgraduates preparing for exams, and MBBS students, to help them learn ENT clearly and score well. Browse all ENT notes and lectures on The ENT Resident: https://www.theentresident.com/ent-notes-lectures.md ## Premium ENT Notes Alongside these free notes, The ENT Resident also offers Premium ENT Notes. This is a paid collection of 250+ detailed, high-yield ENT notes that cover the full ENT syllabus, including topics across Otology, Audiology, Rhinology, Larynx and Trachea, Pharynx, Oral Cavity and Salivary Glands, Neck, Thyroid, ENT Surgeries, and Recent Advances in ENT. The Premium ENT Notes are written for ENT residents, ENT postgraduates, and MBBS students who want one consistent resource for both theory and practical exam preparation. They include high-yield difference tables, replicable exam diagrams, step-by-step surgical guides, mnemonics, and clinical pearls. Buying once gives you immediate access to the complete set, plus all newly added and updated notes during your access period. The access period depends on the plan you choose, and it is stated clearly at the time of purchase. After purchase, you get access to the premium notes platform, where you can read all the notes online and download them for offline access. Purchase options: - Buy all premium ENT notes (international students): https://theentresident.gumroad.com/l/ENTResidentNotes - Buy all premium ENT notes (Indian students): https://dub.sh/ent-residency-notes Preview a full sample note from the Premium ENT Notes, in the "Preview a Full Sample Note" section of this page: https://www.theentresident.com/premium.md Read what ENT residents and students say about The ENT Resident: https://www.theentresident.com/testimonials.md ## Contact To contact The ENT Resident or inquire about the Premium ENT Notes, email theentresident@gmail.com, or message on WhatsApp at +91 82402 14763 (https://wa.me/918240214763). Other contact options are on the contact page: https://www.theentresident.com/contact.md ## Other ENT Notes Categories - [Audiology](https://www.theentresident.com/ent-notes-lectures/category/audiology.md) - [Classifications and Gradings in ENT](https://www.theentresident.com/ent-notes-lectures/category/classifications-and-gradings-in-ent.md) - [Clinical Case Presentations](https://www.theentresident.com/ent-notes-lectures/category/clinical-case-presentations.md) - [Differences Tables in ENT](https://www.theentresident.com/ent-notes-lectures/category/differences-tables-in-ent.md) - [Drawings in ENT](https://www.theentresident.com/ent-notes-lectures/category/drawing-in-ent.md) - [History and Clinical Examination](https://www.theentresident.com/ent-notes-lectures/category/history-and-clinical-examination.md) - [Instruments in ENT](https://www.theentresident.com/ent-notes-lectures/category/instruments-in-ent.md) - [Larynx and Trachea](https://www.theentresident.com/ent-notes-lectures/category/larynx-and-trachea.md) - [Mnemonics in ENT](https://www.theentresident.com/ent-notes-lectures/category/mnemonics-in-ent.md) - [Neck](https://www.theentresident.com/ent-notes-lectures/category/neck.md) - [Oral Cavity and Salivary Glands](https://www.theentresident.com/ent-notes-lectures/category/oral-cavity-and-salivary-glands.md) - [Otology](https://www.theentresident.com/ent-notes-lectures/category/otology.md) - [Pharynx](https://www.theentresident.com/ent-notes-lectures/category/pharynx.md) - [Rhinology](https://www.theentresident.com/ent-notes-lectures/category/rhinology.md) - [Short Questions in ENT](https://www.theentresident.com/ent-notes-lectures/category/short-questions-in-ent.md) - [Signs, Syndromes, Triads, and Compilation Lists in ENT](https://www.theentresident.com/ent-notes-lectures/category/signs-syndromes-triads-lists-in-ent.md) - [Surgery](https://www.theentresident.com/ent-notes-lectures/category/surgery.md) - [Thyroid](https://www.theentresident.com/ent-notes-lectures/category/thyroid.md) --- Complete index of all pages on this site, with descriptions and markdown links: https://www.theentresident.com/llms.txt